Method of making cemented carbide body

US6706327B2 · kind B2 · utility

Assignee

• SANDVIK AB · SE

Inventors

• Per Blomstedt · Luleå, SE
• Mikael Lagerqvist · Upplands Väsby, SE
• Marian Mikus · Härnösand, SE

Key dates

• Filing date: Oct 11, 2001
• Grant date: Mar 16, 2004
• Expiry date: Dec 27, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31844
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A method of making a cemented carbide body having WC with an average grain size of 0.5-4 &mgr;m, 3.5-9 wt % Co and <2 wt % carbides of Ta, Ti and Nb, and with a substoichiometric carbon content, the method including sintering the body such that an eta phase containing structure is obtained with a size of 1-15 &mgr;m and a content of 10 vol. %-35 vol. %, and subjecting the body to recarburization such that the eta phase in a 50-350 &mgr;m wide intermediate zone is transformed to WC+Co without essentially changing its Co-content.